Databases & Message Queues

I have included message queues in this category given the durability of information written to a message broker.

RocksDB      |...........................
SQLite       |.........................
PostgreSQL   |........................
TiKV         |..........
Sled         |.............
MongoDB      |...................
Memcached    |...............................
Reddis       |.......................
Kafka        |........................
RabbitMQ     |.....................
-------------|-----------------------------------------
proficiency  0        25        50        75        100